Bevilaqua, Marcus, and Claudio Ruy Vasconcelos da Fonseca. 2020. “Two New Species of Passalus Fabricius (Coleoptera: Passalidae) from the Western Brazilian Amazon With Comments on the Taxonomic Limits of the Subgenera”. Papéis Avulsos De Zoologia 60 (special):e202060(s.i.).19. https://doi.org/10.11606/1807-0205/2020.60.special-issue.19.